[vim/vim] GVim Very Slow on High Resolution Displays (Issue #20479)
Benjamin Block
mageta created an issue (vim/vim#20479)Steps to reproduce
When I use GVim (GTK+-3) on high resolution displays it is extremely sluggish/slow. Especially during scrolling everything slows down to a crawl.
Here is a short video showing the effect (me scrolling fast with the mouse wheel, and calling a command that creates a list on screen):
https://github.com/user-attachments/assets/922caf32-d350-49ab-acf9-69d7c9810b81
It's been like that for quite a while now. I tried using the configuration option set lazyredraw, but that doesn't help.
I mainly use Wayland, but even if I start GVim with env GDK_BACKEND=x11 gvim -Y it doesn't improve much (it actually improves a little, but not much).
I tried compiling GVim against GTK-4; but that was basically unusable. It's even worse than GTK+-3, not sure why.
Any ideas why that might be?
Expected behaviour
GVim is fast and responsive.
Version of Vim
9.2.0612
Environment
Operating System: Fedora Linux 44
KDE Plasma Version: 6.6.5
KDE Frameworks Version: 6.26.0
Kernel Version: 7.0.11-200.fc44.x86_64 (64-bit)
Graphics Platform: Wayland
Logs and stack traces
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